Progressive Weber Choke, Looking for info on proper adjustment Options

[Spoke]

I'm new to this board and looking for info on adjusting the choke on my progressive Weber carb (single 2 barrel, progressive Weber, don't know the model type). Just bought the car last year, 71 914 w/1.7L. When first started and the engine is choked and when fully heated, the car runs real good. But after the first couple of minutes (when the choke opens), pre-warm low RPM (below 2k) has almost no power and difficult to get off the clutch without revving the engine above 2-3K. The choke opens pretty fast and the engine thermostat is missing but on order. I have a couple of questions about the carb and choke setup:

1) Is there a setup or adjustment for the choke to change the speed at which it opens?

2) I've read about the stock FI intake where warm-air is circulated into the air cleaner. I can't find where the warm air comes from in the sheet metal and how would I (or do I need to) get warm air into the carb? The air cleaner is a simple snap on type. (See pic)

3) There's a hose from the crankcase to the carb from the oil filler that seems to be a breather. What is this for and how should it connect to the carb? Should there be a valve or something on this hose?

Thanks,
Spoke